using popen4

gistfile1.rb

require 'popen4'

cmd = "ls /tmp"
status = POpen4::popen4(cmd) do |stdout,stderr,stdin,pid|
  stdin.close

  # get the stdout 
  puts "stdout: #{stdout.read.inspect}"

  # get the stdin
  puts "stderr: #{stderr.read.inspect}"

  # get the PID
  puts "pid: #{pid}"
end

puts "exitstatus: #{status.exitstatus}"